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CS 461 Oct. 10
Review PL grammar as needed
How to tell if a word is in a CFL?
Convert to PDA and run it.
CYK algorithm
Modern parsing techniques
Accepting input
How can we tell if a given source file (input
stream of tokens) is a valid program?
Lan

Advance Computer Architecture
Lecture 20
Superscalar
Out-of-Order Execution
2
OOO Motivating Code Sequence
Two independent sequences of instructions enable
flexibility in terms of how instructions are scheduled in
total order
We can schedule statically

Eliminating Computation
Aside from loop unrolling/scheduling,
another useful pursuit for the compiler
DADD R1, R2, R3
is to replace some common
DADD R4, R1, R6
computations by storing the first resultDADD R8, R4, R7
Here, we have two RAW
in a register
Haz